128 
MR. A. E. OXLEY ON THE INFLUENCE OF MOLECULAR 
phenylhydrazine melts at 20° C., there was no need to use the copper cylinder, which 
ordinarily surrounded the phial, and so it was possible to watch the substance 
throughout the transition. The crystals were found to be more diamagnetic than 
the liquid and the mean value of 8x/x was 47 per cent. The gelatinous form was 
stable at low temperatures and had a susceptibility equal to that of the liquid above 
the normal fusion point. The crystals obtained at low temperatures gave rise, on 
warming, to a large number of small bubbles, which prevented observations being 
made on the crystals at temperatures much below the freezing point. 
Acetophenone. I^J . 
The liquid was frozen to a white crystalline mass which melted at 19° C., 
accompanied by an increase of diamagnetism amounting to 4'5 per cent. On allowing 
the liquid to stand for two days crystals again appeared, but these were transparent 
and very much larger. The susceptibility of these crystals was smaller than that of 
the liquid by 4 per cent. The crystals were again tested after three days but no 
further decrease of diamagnetism was observed (fig. 9 h). 
Benzophenone. 
0 
/\_n_/\ 
I I u I i 
V 
Two curves for this substance are shown in fig. 13. It will be seen that in each 
case the benzophenone passed into the gelatinous state on cooling. This state appears 
Temperature (°C) 
F! G. 13 
to be unstable and, on cooling sufficiently, crystallization sets in, which is accompanied 
by a decrease of x amounting to 6 per cent, (approximately). In the fi”st experiment 
the transition took place when the liquid had been super-cooled abour 30° C. ; in the 
